Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d96ca9758599b05…

MALICIOUS

PDF

79.8 KB Created: 2021-09-13 00:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0441235ec5f099b62b22909ed1102002 SHA-1: 1abc821cc571ca94aef14d19402374d5a96188d5 SHA-256: 3d96ca9758599b05205a555a1e8d59b3c76b69c0c15be77d471e797c98708819
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. While no scripts were directly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crysiq.ru/uplcv?utm_term=superhero+fight+sword+battle+mod+apk PDF link annotation
    • http://akbarestate.com/survey/userfiles/files/sitavesagexixejunav.pdfIn PDF document text
    • http://interiorsexpress.biz/dayafter/uploadimages/newsimages/file/nupetijixujakorofokerak.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/suzisazuzudawisura.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/59760928695.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6a8169c3c---funejilufojonuba.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/70252571368.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/32891187191.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/53914942050.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/kegejaxoli.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/teveto.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/vasafusenarojudezesulopo.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/59098876644.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/fegeminojibemoti.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/zikulovopobaboxipejij.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/64672358364.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d79ba2e74d---vipol.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/81677978327.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/xumikajib.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613436281e0c1---topidebinudav.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/72079952883.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/kesekizosa.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/45045143993.pdfIn PDF document text
    • https://unosms.us/userfiles/file/69982925718.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1A 11332 bytes
SHA-256: 3dca118b7c2cdfb3d0bfa6fb6f50899694b10ddb6410b6702d5357f1ccd82c24
font_01_sfnt_off0000e763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE763 18940 bytes
SHA-256: 1ee9d8fd7f861e9629b8d9382ce0f00e0e5592357637e2f436a09232c84ad988
font_02_sfnt_off000119bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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